Locomotive brake



(No ModeL) 2 Sheets-Sheet 1.

G. H. POOR.

LOGOMOTIVE BRAKE.

No. 300,124. Patented June 10, 1884.

WiXYAQSSQIR N. PETERS. Phmo-Lkhographun wuhinpon,

(No Model.)

2 shee ts sheet 2. G. H. POOR.

LOOOMOTLVE BRAKE.

Patented June 10, 1884.

"IRS. Pholo-Lithagupher. Washingion, Dv C.

GEORGE H. POOR,- OF s r. LOUIS, MISSOURI, ASSIGNOR :ro THE AMERICAN BRAKE COMPANY, OF SAME PLACE.

LocoM'oTwE-BRAKE.

SPECIFICATION forming part of Letters Patent so. $66,124, dated June 10,1884.

Application filed November 12, 1883. (No model.)

To all whom, it may concern:

Beit known that I, GEORGE H. PO R, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements-in Locomotive Brakes; and I hereby deelare the following to be a full, clear, and exact description of .the

same, reference being had to the accompanying drawings, wherein- Figure 1 is an elevation, partly in section,

showing the preferred form; and Fig. 2 is a similar view of a modification.

Like letters refer to like parts wherever they occur. I

v My invention relates to the construction of brakes for locomotive-engines; and it consists, generally, in interposing between the shoes and power a spring or equivalent elastic medium, whereby rigid pressure between the wheels is avoided, and injury or strain on the journals, brasses, crank pins, and parallel rods is prevented.

The organization of power-brakes for cars and for locomotives varies in a very essential particular-viz., while the power for the earbrake is commonly applied through the brakebeam, and the shoes are arranged to the outside of the wheels, the power for locomotivelo'rakes is applied by piston-rods, toggle or eecentric faced levers, arranged between the drive-wheels, to shoes also arranged between the wheels. In the first instance (car-brakes) the problem has been to apply the pressure so as to prevent the slipping of the wheels and 5 injury thereto, while in the second instance the problem is to apply the power in such man ner as to avoid such rigid pressure as would injure the journals, brasses, 850., of the drivewheels. This latter result I have accomplished 40 by the interposition of an elastic medium between the power and shoes of locomotivebrakes, all as will hereinafter more fully appear.

I would here state that I am aware that in 4.5 the construction of car-brakes a spring or equivalent yielding medium has been inter posed between the shoe and the brake-beam to apply a yielding pressure to the shoe which will prevent the slipping of the wheel, and

consequent injury to the tread of the wheel,

and I do not herein claim the same.

I will 'nowprocecd to describe my invention morefspeci'fically, so that others skilled in the art towhich it appertains may apply the same.

In the drawings, A indicates the locomotiveframe, and B B the drive-wheels. Bolted to i the loco'm otive-frame between the d rive-wheels indicates the piston-rod, whichpasses through theguide-bracket F, secured to the 6 face-plateO, and may be provided with a movable collar and set-screw, to regulate the travel of the piston-rod, (as shown in patent to O. J. Schiller, No. 283,028.) hen sucn collar and set-screw are provided, they may be adjusted 0 to compensate for the wear of the brake-shoes, lost motion, &c.

G indicates a yoke, (or link, as the case may be,) pivoted to the lower end of piston-rod E, and by its opposite end to the toggle or fulcrum 7 5 levers which actuate the brake'shoes. In the preferred form, Fig. 1, these toggle or fulcrum levers embrace the springs, and are constructed as follows: Coupled to the yoke (orlink) G are cups H, and to the shoes corresponding cups, H, between which are inserted spiral or equivalent springs I, the whole connected by through-bolts K, the nuts k of which are held in sockets of.the cups H, so as to prevent their backing off. The object of the interposed link or yoke G (or joint) is to permit adjustment between the shoes and power, so as to compensate for the irregular motion of the wheels, due to rough track, low joints, 00., while the object of the through-bolt and adjusting-nut k is to 0 control the power of the elastic medium interposed between the power and shoes.

L L indicate the brake-shoes arranged between the, drive-wheels, and suspended from the face-plate 0, frame A, or other suitable 5 point by the hangers M or equivalent means.

To the brake-shoes Lthe spring-cups H are pivoted, as before specified.

In the modification shown in Fig. 2 the re lief-springs employed are semi-elliptic or leaf Ioo springs 1, arranged in recesses of the shoes L, and the fulcrum or toggle levers which connect the link or yoke G with the shoes are jointed, as at p, to the spring-band, so as to allow the spring to always work in the recess of the shoe with direct pressure.

I have shown and described the interposed elastic medium as a spring or springs; but it is evident thatindia-rubber or like elastic material may be employed without departing from the present invention.

The devices, being substantially of the character hereinbefore specified, will operate as follows: The power, being applied to set the brakes of the drive wheels, will operate through piston-rod E, yoke or link G, and the toggle or fulcrum levers and springs (or equivalent elastic medium) upon the shoes LL, forcing the same in opposite direction against the drive-wheels with a yielding pressure, the link or yoke G permitting equalization in the adjustment of the shoes, so as to compensate for any irregular motion of the wheels, while the springs (or equivalent elastic medium) prevent rigid pressure on the journals, brasses, 850., which would injure the same.

Having thus described the nature, operation, and advantages of my invention, what I claim, and desire to secure by Letters Patent, is

1. In a locomotive power-brake wherein the. shoes are arranged between the drive-wheels, and the power is applied by means of a pistonrod in connection with toggle or eccentric faced levers, the combination, with the shoes dium interposed between the same, substan tially as and for the purposes specified.

2. In a locomotive power-brake, the combi- I the toggle-levers and brakeshoes, substan-- tially as and for the purposes specified.

'3. In a locomotive power-brake, the combination, with two drive-wheels and a pistonrod, of two brake-shoes arranged between the drive-wheels, toggle-levers for applying power to the drivewheels, elastic medium interposed between the toggle-levers and shoes, and a yoke or link interposed between the power and togglelevers, substantially as and for the purposes specified.

4. In alocomotive-brake, the combination of two brake-sh oes arranged between th e drivewheels, a piston-rod for applying power thereto, a yoke pivoted on the piston-rod, springcups pivoted 011 the yoke and on the brakeshoes, and spiral springs arranged between the spring-cups, to form yielding toggle-arms between the yoke and the brakcshoes, substantiall y as and for the purposes specified.

In testimony whereof I a'ffix my signature, in presence of two witnesses, this 9th day of November, 1883.

GEORGE H. POOR.

lVitnesscs:

G120. R. Yos'r, E. B. Lure-n. 

